Another reason I suspect is the C-L-C pi network allows both the variable
capacitor rotors to be at ground potential. This lets the shaft be at
ground potential making for a safer control that is not affected by the
proximity of the human operator's hand. No insulated shaft required either!
Chris, AB6QK
>
>Is there any particular reason the L-C-L T-match is better or worse than
>the more standard C-L-C pi network in this application ?
>
>Thanks,
>Steve, N2IC
>REPLY:
>In order to achieve a wide range of impedance matching, you need to
>have two of the three elements variable. Variable capacitors are
>preferred by most designers over variable inductors for reasons of
>cost, wider range of adjustment and availability. Aside from those
>constraints, either circuit will do the job.
>73, Bill W6WRT
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